Instruction device for musical instruments



M. SCHANTZ.

INSTRUCTION DEVICE FOR MUSICAL INSTRUMENTS. APPLICATION FILED APR-6.1911- RENEWED MAR. 4.1919.

' 1 324,277. Patented Dec. 9, 1919.

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E. M. SCHANTZ.

INSTRUCTION DEVICE FOR MUSICAL INSTRUMENTS.

APPLICATION r1150 APR. 6. 1911. RENEWED MAR. 4. 1919.

1 324,277. Patented Dec. 9, 1919.

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\ EDWIN M. SCHANTZ, OF CHICAGO, ILLINOIS.

INSTRUCTION DEVICE FOR MUSICAL INSTRUMENTS.

Specification of Letters Patent.

Patented Dec. 9, 1919.

Application filed April 6, 1911, Serial No. 619,290. Renewed March 4,1919. Serial No. 280,654.

. lowlng 1s a specification.

The principal object of my invention is to provide a new and improvedapparatus for progressively indicating to a novice how a musicalinstrument should be operated to play a particular composition. Anotherobject of my invention is to provide a new and improved method fordirecting-a novice in playing a musical instrument. Another ob ect of myinvention is to provide a piano attachment which shall indicate byvisual signals what keys are to be struck and in what order of sequenceto play a particular composition on the piano. These objects and variousothers will be more readily understood and appreciated in connectionwith the accompanying drawings, in which Figure l is a generaldiagrammatic rep resentation ofthe apparatus.

Fig. 2 is a perspective view of a piano keyboard with the apparatusapplied thereto.

Fig. 3 is a top plan view of the keyboard attachment.

Fig. 4: is a section ,on the line 4 in Fig. 3; and

Fig. 5 is a front elevation of the keyboard attachment.

The apparatus disclosed in the drawings constitutes one particularembodiment of my invention which I have chosen to illustrate anddescribe in order to make clear the principles involved. The inventionmay be embodied in other forms falling within the definition of theappended claims.

In a general way, the apparatus comprises a transverse bar .17,supportedabove the white keys l5 and the black keys 16 of the piano.Within this bar are little electric lamps 27, one for each key. Acabinet, designated 39 in the diagram of Fig. 1, stands at anyconvenient place and is connected to the bar 17 by a cable 38. There isa perforated music sheet 40 within the cabinet 39, which, with otherapparatus, causes the lamps 27 to be lighted when the Corresponding keysshould be struck by the operator, so that the illumination of theselights affords a guide to the operator when to strike the keys.

aving suggested the nature of the particular embodiment of my inventionshown in the drawings, I now proceed to describe it more in detail. o

The bar 17 is supported at its ends on the ledges 18 and a propervertical adjustment is secured by means of the adjusting screws 24. Theend 20 of the bar 17 also carries a horizontal screw 21 and a guide 23,which control the felt-covered plate 22 and press the same against thecheek blocks 19 of the piano. By means of the screws 21 the bar 17 canbe adjusted laterally.

A series of vertical holes 25 are bored in the bar-17, and in these aremounted little electric lamps 27, telephone switchboard lamps beingsuitable for this purpose. Branch holes 26 are provided to make thelight of the lamp 27 visible from the front. The lamp contact terminals28 and 29 are provided, as shown in Fig. 4:, the terminal 28 for eachlamp being connected to a respective conductor in the cable 30. Theterminal 29 is a part of the leaf spring contact terminal 36.

Along the lower rear edge of the bar 17 is a metal strip 31 with aseries of lugs on which. are pivoted bell crank levers 32. Some of theselevers have their forward ends resting directly on the black keys 16, 1

While others have knobs 33 thatreach down and rest on the white keys 15.The upper ends, 34, of the levers 32 normally hold the leaf springs 36back in contact with the sheet metal casing 64, But when akey- 15 or16is depresseo, this permits the corresponding lever 32 to drop down, sothat the end 34 comes in contact with themetal strip 35 and also permitsthe leaf spring 36 to break contact with the sheet metal wall 64 andmake contact with the terminal 37. The electrical connections of thekeyboard attachment are shown at the 'left of Fig. 1 and are theredesignated with numerals corresponding with those employed in the otherfigures. The connections are apparent in the diagram of Fig. 1 and willbe traced in describing how the device operates later in thisspecification. The bundle of conductors 38, forming a cable, leads fromthe keyboard attachment to a little cabinet 39, which may beconveniently placed on the floor at one side of the piano. grammaticallyin Fig.1. 40 is a perforated sheet of music, similar in some respects tothose used in automatic piano players. In normal operation it moves inthe direction of the arrow 41, winding upon the roll 42, driven by themotor 44, and unwinding from the roll 43. Between the two rolls thesheet passes over a metal bar 45. Contact terminals 46, 47, 48, 49 and.50 rest on the paper 40 and are adapted to make contact with the metalbar 45 when the perforations in the paper 40 pass under them. Variousperforations in the paper are designated 51, 52, 53, 54, and 63. I

A battery 56 has one terminal connected to the metal bar 45 and theother terminal extended in two multiple branches, one of which goesthrough the relay magnet 57 and thence to the bar 31, which carries allthe levers 32. The other branch from the battery 56 goes to the contactterminals 37.

When the relay magnet 57 is energized, it closes the contacts 58, andthus closes the circuit of battery 59 and energizes the mag net 60.This-magnet attracts the armature 61, causing it to act as a brake onthe wheel 62 carried by the drive roll 42.

Having described the structure of my improved apparatus, I will now tellhow it works- The motor 44 drives the music sheet 40 substantiallyuniformlyin the direction of the arrow 41. When there are noperforations under the contact terminals, such as 46, then the battery56 is on open circuit and no lamps will be lighted. Assume now that theperforation 63 passes under the terminal 48, this closes a circuit whichis traced as follows; battery 56, metal bar 45, contact finger 48,conductor 65, lamp 27, contact terminal 36, lever arm 34, bar 31, andrelay 57.

Accordingly, the result of the hole 63, pass-' ing under the finger 48,is to light the lamp 27 and by the action of the relay 57 cause thebrake 61 to engage the wheel 62 and stop the music sheet 40. I

The operator, on seeing the lamp 27 light up, strikes the correspondingkey 15, which permits the lever 32 to drop. The dropping of the lever 32closes the contacts 3637 and 3435. The result is that the circuit whichwas formerly traced goes as before through the lamp 27, but returns tothe battery through the contact terminals 36 and 37 and conductor 66,thus deenergizing the relay 57 Hence, when the key 15 is struck, thebrake 61 releases the wheel 62 and permits the music sheet 40 to travelforward. Meanwhilethe lamp 27 continues to burn as long, and only aslong, as the perforation 63 is I passing under the contact finger 48.

Thus it will be seen that the music roll 40 stops whenever the studentfails to strike This cabinet 39 is shown diaa key illuminated by a lampand the apparatus remains stationary, and that lamp continues to burnuntil the corresponding key is struck.

Where there is a series of perforations for repeating on a single note,the student might hold the corresponding key down permanently and thusmake the music sheet 40 go along as if he were. playing the properrepetition, To avoid this, I provide two extra contact fingers 46 and47, one for the Consider the base, and one for the treble. twoperforations 51 for repeating a particular treble note. In transversealinement with the space between these two perforations 51 there is ahole 52, so that when the contact finger 50 is resting on the paperbetween the two perforations 51, then the contact finger 47 engages thehole 52.

When the music sheet 40 brings the first hole 51 under the contactfinger 50 the corresponding lamp 27 (the lowermost one in Fig. 1) willlight up and the music sheet 40 will stop. Then a depression of thecorresponding key 15 will start the music sheet 40 along. Of course,when the light 27 goes out, the student should release the key 15, butif he fails to do so, then when the perforation 52 comes under thecontact finger 47, a circuit will be completed which is traced asfoll0ws:56, 45, 47, 67, 35, 34, 31, 38 and 57 This circuit includes therelay 57, and therefore the brake 61 will be actuated and. stop themusic sheet 40. Hence, if the student fails' to raise his key 1.5between the two perforations 51, then the effect of the intermediateperforation 52 will be to stop the music roll. As soon as the studentraises the key 15 the circuit last traced will be broken at 3435, whichwill release the brake 61 and permit the sheet 40 to go forward. Theperforation 54 registers with the' interval between the two perforations53 in the bass, and this perforation 54 cooperates with the contactmember 46 in a manner similar to that just described for the perforation52 with the contact member 47. r

It will be observed that in transverse alinement with the twoperforations 51, there is shown a long perforation 55 in the bass. Ofcourse, the student will properly hold down the corresponding key 16 forthis, but when the perforation 52 passes under the contact finger 47this will close a circuit only if some key in the treble is being helddown and will not be affected by holding a key in the bass.

In explanation of the terminology employed in certain of the followingclaims I will state,tha t the paper sheet 50, shown in Fig. 1, is anexample of a movable member, selector or control element and that theperforations therein constitute local modifications thereof. In the caseof a piano, the

keys form the operative elements or playing elements to be engagedmanually by the keys.

I respondence with a particular musical composition.

2. In combination, a piano, stationary signals associated with therespective keys thereof, and means to actuatethose signals in definiteorder as the keys should be struck by a player in correspondence with aparticular musical composition.

3. In combination, a piano keyboard, a bar adjacent thereto, stationarysignals carried by the bar adjacent to respective keys of the piano, andmeans to actuate said signals in definite order in correspondence with aparticular musical composition.

4. In combination, a piano keyboard, a bar adjacent thereto, electriclamps carried by said bar adjacent to respective keys, a source ofelectromotive force to energize said lamps, and means to close thecircuits of the lamps in correspondence with a particular musicalcomposition.

5. In combination, a piano keyboard, a bar adjacent thereto, respectiveelectric lamps for the keys carried by said bar, a circuit for each ofsaid lamps, a source of electromotive force to energize said lamps,

' a perforated music sheet, and contact terminals rendered operative bythe perforations 1n said music sheet to close the circuits of therespective lamps 6. In combination, a piano keyboard, a

transverse bar adjacent thereto, electric lamps carried by the bar forthe respective piano keys, a battery, branch circuits for the lamps, aperforated music sheet, and contact terminals for said branch circuitsadapted to close through the perforations of the music sheet.

7. In combination, a piano keyboard, a transverse bar ad acent thereto,slgnals cartransverse bar adjacent thereto, signals carriedthereby-opposite the respective keys of the keyboard, means to actuatesaid signals whereby the bar may be positioned iano keyboard,

in a definite order, and adjusting screws carried by the bar andengaging the piano framework at the ends of the keyboard, properly withreference to the keyboard.

9. In combination, a piano keyboard, a transverse bar adjacent thereto,said bar having holes therein adjacent to respective keys of the piano,small electric lamps in said holes, and means to energize said lamps toindicate in some respects how the piano shall be played.

10. In combination, a piano keyboard, a transverse bar adjacent theretoand having vertical holes adjacent to respective keys of the piano,signal lamps in said holes,said bar also having forwardly extendingbranch holes to show the light of the lamps, and means to energize saidlamps to show the order in which the keys of the piano should be played.

11. In combination, a piano keyboard, a transverse bar over the same, aseries of lamps carried by the bar adjacent to respective piano keys,means to energize the lamps in accordance with a musical composition tobe played on the piano keys and to continue the energization of eachlamp until the corresponding key is played;

12. In combination, a piano keyboard, a

transverse bar over the same, a series of electric lamps carried by thebar, each adjacent to a respective piano key, levers fulcrumed on thebar and resting on respective keys, circuits for the respective lamps,and normally closed contacts in said circuits arranged to be opened bysaid levers.

13. In combination, a musical instrument having a series of elements tobe operated by the player, a. series of signals arranged in playing ofthe keys for a particular musical composition, and means to arrest theprogressive actuation of the signals continuing the actuation of asignal if the corresponding key is not played.

15. In combination, a piano keyboard, a series of signal lamps supportedadjacent to the respective keys, energizing circuits therefor, aperforated music sheet to control said circuits, a motor to drive saidsheet, and means to arrest the motor when a key is not played after itssignal lamp is energized l 30"" sheet, a brake to stop the motor,electromagnetic means to apply the brake simultaneously with the displayof any signal, and means operated by the depression of a key to open thecircuit of said electromagnetic means and thereby release the brake.

17. In combination, a piano keyboard, a series of signal lamps for therespective keys, electric circuits to energize said lamps, a perforatedmusic sheet to control said circuits, said sheet having extraperforations in transverse alinement with the spaces between repeatedperforations, another circuit, means actuated by said extra perforationsto close said circuit, and means controlled by said circuit to stop theprogress of the perforated music sheet when a piano key is held incorrespondence with the repeated perforations.

18. The method of instructing a person how to play a particularcomposition on a musical instrument, which consists in actuating a setof stationary signals in definite order and thus indicating the order inwhich the various elements of the instrument shall be actuated by theplayer.

19. The method of instructing a person how to play a particularcomposition on a musical instrument, which consists in attuating a setof signals in definite order and thus indicating the order in which thevarious elements of the instrument shall be actuated by the player, andcausing the signals to hold their indication until the proper play ismade by the player.

20. The method of instructing a person how to play a particularcomposition on a piano, which consists in energizing a set of respectivesignal lamps for the piano keys by means of a perforated sheet of music,and thereby indicating in appropriate time-order how the keys shall beplayed to play the complete composition.

21. The method of instructing a person how to play a particularcomposition on a piano, which consists in energizing a set of respectlvesignal lamps for the piano keys by means of a perforatedsheet of music,thereby indicating in appropriate timeorder how the keys shall be playedto play the complete composition, and causing the music sheet to stopits movement and hold a signal until the key corresponding thereto hasbeen pla ved.-

22. In combination, a musical instrument, a series of signals toindicate how it shall be played, means to actuate these signals inproper time order, means to repeat a certain signal when a particularnote is to be repeated on the musical instrument, and means to arrestthe progressive actuation of the signals when the musical instrument isplayed in such a manner as to hold the note that should be repeated.

23. In combination, a musical instrument comprising keys, a series ofsignals for the respective keys, a movable member adapted to actuatesaid signals, said member having various local conformations ofstructure at different places corresponding to the actuation ofdifferent keys at different times, also having extra such localconformations positioned to come in action between repeated notes, andmeans actuated by said lastnamed local conformations to arrest the oeration of the signals in case a key is held when it should be repeated.

2i. In combination, a musical instrument having a series of elements tobe operated by the player, a series of signals arranged in the order ofsaid elements, means to actuate said signals in a predetermined order toindicate how a musical composition shall be played, and means actuatedbetween successive repeat signals to arrest the successive are actuate dto continue the actuation of said signals for the proper intervals.

26. In combination, a piano keyboard, means to display signals eachvisually assooiated with a respective key, and means to cause thedisplay of such signals in time order as the keys should be struck by aplayer in correspondence with a particular musical composition.

27. In combination, a musical instrument having a series of elements tobe operated by the player, a series of signals respectively adj aeent tosaid elements to indicate in some respects how the instrument is-to beplayed,

' and means to actuate those signals in definite order in correspondencewith a particular musical composition.

28. In combination, a piano, a set of signals each associated with arespective key of the piano, and means to actuate those signals indefinite order as the keys should be struck by a player incorrespondence with a particular musical composition.

29. In combination, a piano keyboard, a series of signal lamps supportedadjacent to the respective keys. energizing circuits therefor, aperforated music sheet to control said circuits, means to drive saidsheet, and means to arrest said sheet when a key is not played after itssignal lamp is energized.

30. In combination, a musical instrument having a series of operativeelements adapted to be operated by the player, a series of signals, eachsignal being fixed in registry With a corresponding operative element,means to, operate said signals in predetermined sequence, and means toinsure the r ontinued operation of a signal until the correspondingoperative element of said instrument has been actuated for the properinterval of time. t

31. In combination, a series of signals, one such signal being providedfor each operative element of a musical instrument, means to operate thesignals in predetermined sequence, and means to automatically arrest thecontinued operation of the signals until the operative elementcorresponding to the.

operated signal has been operated.

32. In combination, a series of signals, one such signal being providedfor each operative element of a musical instrument, energizing circuitsfor actuating said signals independently of each other, a perforatedsheet to control'said circuits, means to move said sheet to cause theactuation of said signals, and means to arrest said sheet, said meansbeing actuated when an operative element is not operated after itssignal has been actuated.

33. The combination with a musical instrument comprising a plurality ofelements to be manipulated by the'player, of a series of signals eachfixed in register with one of said elements, means for energizing saidsignals in predetermined sequence to preindicate the order in which saidelements should be manipulated, andmeans in combination with a part ofsaid first-named means for deenergizing each signal by the manipulationof the indicated element.

34.111 combination, means for indicating the successive charactersforming the score of a musical composition, a series of elements to bemanually manipulated by the player in playing a musical instrument, andmeans controlled by the manipulation of said elements of the instrumentand operative when said elements are manipulated in predeterminedsequence fc causing the indication of the next succeeding character ofthe composition.

35. A musical instrument comprising a plurality of elements to bemanually manipulated by the fingers of the player, in combination With aseries of independent signals each located in register with one of saidelements, and means controlled by the manipulation of said elements foractuating said signals in predetermined sequence in accordance with aparticular musical composition, said means comprising parts for causingthe manipulation of an element to actuate the signal for the nextelement to be' manipulated.

36. The combination with a musical instrument comprising a series ofelements to be manipulated by the player, of a series of signals eachfixed in register with one of said elements, and means separate fromsaid instrument for operating said signals in predetermined order toindicate the order in Which said elements should'be manipulated to playa musical composition.

37. In combination, a series of elements of a musical instrument to bemanipulated by the player, a series of independent fixed signals one foreach of said elements, and means controlled exclusively by the operationof the indicated elements for operating the signals in predeterminedsequence in accordance with a particular musical composition.

38. 'In combination, a plurality of elements of a musical instrument tobe manipulated in playing the same, a series of separate independentlyoperable stationary signals, one for each of said elements, and meanscontrolled by the said elements to energize, upon the playing of saidelements in correct sequence, the signal pertaining to thenextsucceeding element to be manipulated in reproducing a predeterminedmusical composition.

39. In combination, a selector having 10 cal modifications representingsuccessive musical characters of a particular musical composition, meansfor successively presenting each modification of the selector inoperative position, a series of elements of a musical instrument to bemanually manipulated by the player, a series of signals arranged in theorder of said elements of the instrument, means for forming operativeconnections between each signal and said selector, and means incombination with a part of said first-named means and operated by themanipulation of the indicated elements by the player for causing thesucceeding local modifications of the selector to be presented inoperative position to establish said connections for the signalscorresponding to succeeding elements of the instrument to be played.

40. In combination, a series of elements of a musical instrument to bemanually manipulated, a control element bearing local modificationsrepresenting successive musical notes of aparticular musicalcomposition, and means controlled by the manipulation of said elementsof the musical instrument in a predetermined sequence corresponding tothe musical composition represented upon the c0ntrol element foroperatively connecting each successive local modification of the controlelement with its corresponding element, said means being inoperativewhen the elements are manipulated in other than said predeterminedsequence.

41. In combination, a plurality of elements of a musical instrument tobe manipulated by the player, a control device bearing localmodifications representing successive notes of a particular musicalcomposition, and electrically operated means controlled by the operationof the elements of the musical instrument to indicate to the player whenthe elements have been manipulated in sequence corresponding witlrthatrepresented by the local modifications of the control device.

42. The combination with a musical instrument comprising a plurality ofelements to be manually manipulated by the player, of a series ofsignals arranged in the order of said elements, means comprising atraveling selector for actuating said signals to pre indicate the orderin which said ele ments should be manipulated, and means in combinationwith a part of said last-named means and controlled by the operation ofthe indicated elements for intermittently advancing said selector, saidlast-named means being unaffected by any elements other than thoseindicated by the actuated signals.

43. A music instructing device comprising means for determining thesequence in which the keys of a musical instrument shall be manipulated,and means controlled by said first-named means for indicating to theplayer that the keys have been manipulated in a predetermined sequenceand for arrest ing the operation of said first-named means when saidkeys are not operated in a predetermined sequence.

44. In combination, a series of elements of a musical instrument to bemanipulated,

meansdetermining the sequence in which the elements of the musicalinstrument shall be played, a series of signals one for each of saidelements and arranged in the order of said elements, means controlled btermining means for actuatingsaid signals, and means controlled by ,the.manipulation of the indicated elements to cause the operation of thesucceeding signal of the sequence to pro-indicate the next element to beoperated.

45. A music instructing device comprising a series of signals arrangedin the order of the elements of a musical instrument to be manipulated,electric circuits each independently controlling a signal, a travelingcontrol element, local modifications carried thereby, contacts in thecircuits operated by said local modifications to close said circuits andthereby energize said signals in predetermined sequence, electric motorfor actuating the control element, and means rendering said motorineffective simultaneously with the energization of any one of saidseries of signals.

said .de-

, 46. A music instructing device comprising a series of signals one foreach element of a musical instrument to be manipulated, electriccircuits each independently controlling one of the signals, a travelingcontrol ele-- ment, local modifications possessed by said travelingcontrol element, switches in said circuit each operated by localmodifications of the control element to energize the signals inpredetermined sequence, an electro-magnet common to the circuits of allthe signals, whereby said electro-magnet will be energizedsimultaneously with the energization of any one of the signals, andmeans whereby the energization of said electro-magnet will cause thecontrol element to stop.

47. A music instructing device comprising a series of signals one foreach element of a musical instrument to be manipulated manually by theplayer, an electric circuit having a plurality of branches one for eachsignal, a contact in each branch, and a control element controlling theoperation of said contacts whereby the signals will be energized inpredetermined sequence to preindicate the'elements to be manuallymanipulated.

48. A music instructing device comprising a series of signals, anelectric circuit having a plurality of branches one for each signal, acontact in each branch, and a control element controlling the operationof said contacts whereby the signals will be energized in predeterminedsequence, and an electrically controlled element in the circuit andcommon to all the branches adapted to cause the control element to stopupon the energizing of any of the signals.

49. In combination, a plurality of elements of a musical instrument tobe manipulated by the player, a series of signals, an

electric circuit having a plurality of branches one for each signal, aswitch in each branch, and a selector controlling the operation-of saidswitches, an electrically controlled member in the circuit common to allthe branches and arranged to cause the operation of the selector to stopwhen said circuit is closed by the operation of any one of saidswitches, and means to restore the selector to operation by theoperation of an element.

50. The combination with a musical instrument comprising a plurality ofelements to be manually manipulated by the player, of a series ofsignals, one for each of said elements, means comprising an electric circuit having a plurality of branches for controlling said signals, andswitches in said branches each operated by the manipulation of anelement to energize the signal pertaining to the element to be nextmanipulated in reproducing a particular musical composition.

51. The combination with a musical instrument comprising a plurality ofelements to be manually manipulated by the player, of a plurality ofsignals, one for each of said elements, a plurality of electriccircuits, each arranged to cause the actuation of one of said signals,means comprising a traveling control element arranged to close saidcircuits to actuate said signals, means for arresting the progressiveaction of said control element, and means controlled by said elements ofthe instrument for advancing said control element when one of saidelements of the instrument is actuated.

52. The combination with a musical instrument comprising a plurality ofelements to be manually manipulated by the player, of a series ofsignals, electric circuits controlling said signals, means comprising acontrol element for controllingthe opening and closing of said circuits,means for act-uating said control element, said means being arranged tobe rendered inoperative simultaneously wlth the energizlng of a slgnal,

and means whereby the manipulation of an element of said I musicalinstrument will cause the actuating means to operate.

53. In combination, a plurality of ele- 'ments of a musical instrumentto be manually manipulated by the player, means comprising a travelingcontrol element deter mining the sequence in which said elements shallbe manipulated, an electric circuit 7 opened and closed by said controlelement,

means'comprising an electro-magnet in said clrcuit for causmg saldcontrol element to stop when said electro-magnet 1s energlzed,

and means whereby the manipulation of an element of the musicalinstrument will deenergize said electro-magnet.

54., In combination, a series of elements of a musical instrument to bemanually manipulated by the player, means comprising a said electricallycontrolled member inoperative and to establish a second circuit throughwhich the said member will be again rendered operative upon furthermovement of said control element.

56. The combination with a musical instrument comprising a plurality ofelements to be manually manipulated by the player, of a series ofelectrically controlled signals, one for each of said elements, electriccircuits for said signals, a series of switches each operated by one ofsaid elements of the instrument and normally closing the circuit throughthe corresponding signal but arranged to open the corresponding signalcircuit upon the manipulation of the corresponding element, a secondcircuit in combination with said first-named circuits and closedindependently of said signals by one of said switches upon themanipulation of a corresponding element, and means controlled by saidsecond circuit for controlling the succession of the actuation of saidsignals.

57. The combination with a musical instrument comprising a plurality ofelements to be manually manipulated by the player, of a series ofsignals, one for eachelement, means for operating said signals inpredetermined sequence in accordance with a musical composition, meansfor interrupting the action of said first-named means simultaneouslywith the operation of a signal, and means in'combination with saidfirst-named means to restore said first-named means to operation by theoperation of an element corresponding to the signal operated.

58. A music indicator having signals grouped and spaced to register withthe keys of a piano, a. tracker bar, a note sheet, means to move thesheet over said bar, and branch circuits connecting the tracker bar andsignals,

In testimony whereof, I have subscribed EDWIN M. SCHANTZ.

my name.

